The Basic Lake Test bundles the six measurements that limnologists reach for first: pH, conductivity, total phosphorus, nitrate, total Kjeldahl nitrogen, and turbidity. Together they describe your lake's chemical balance, its nutrient supply, and its clarity — the three things that determine whether a lake stays clear and stable or tips toward algae. One surface grab sample, one kit, one certified lab report. If you have never tested your lake and don't know where to start, this is where you start.